438 



RESEARCHES ON FUNGI 



older, without growing appreciably in length. In the exhausted 

 hymenium these cells are found to be short elements which have 

 a superficial origin from the subhymenium. But, in the section we 



FIG. ]A8.Psalliota campestris (wild form). Cross-section of a 

 living gill of a fruit-body just expanded, drawn with a camera 

 lucida. In cutting the section some of the spores on the basidia 

 nos. 1, 2, and 3, were either displaced or knocked off their 

 sterigmata, while the riper spores on nos. 4 and 5 were all knocked 

 off. The details of the spores and sterigmata of these five basidia 

 have been adjusted semi-diagrammatically. All the other cells 

 are shown as observed. Special objects of ^drawing : to show (1) 

 presence of paraphyses and (2) relations of hymenium with 

 subhymenium. h, the hymenium ; s, the subhymenium ; and 

 /, part of the trama. Nos. 1, 2, 3, 4, and 5, present-generation 

 basidia. Nos. 6 and 7, coming-generation basidia. Nos. 18, 

 19, 20, 21, and probably 22, are paraphyses. The elements 

 nos. 4,' 7, 21, etc., arise at diverse levels of the subhymenium. 

 Magnification, 1,040. 



are discussing, the elements nos. 18, 19, 20, 21, and 22 are the 

 shortest elements ; of all the elements present they resemble 

 basidia least ; moreover, they are seated on the outermost sub- 

 hy menial cells. Their contents are already provided with large 

 vacuoles (although this is not indicated in the illustration), as if 

 they were already beginning to empty themselves, and were thus 



